> On the other had, the matter is made moot by using PyUnicode_CheckExact()

Then, in order to keep the pure Python implementation in sync, we'd have to change it to something like this:

if name is None:
   self._name = f'Task-{_task_name_counter()}'
elif isinstance(name, str):
   self._name = name
else:
   self._name = str(name)

I don't know about you, but it looks pretty awkward to me.